Coffee, a hot drink made from the roasted beans (seeds) of the coffee tree. Coffee is a popular beverage in North America, commonly consumed at breakfast or during the morning "coffee break" at work. It contains 1 to 2 per cent caffeine, a substance that stimulates the central nervous system. Caffeine increases wakefulness and alertness, but excessive amounts can cause a number of unpleasant symptoms. Persons who regularly drink more than five cups of coffee daily may experience withdrawal symptoms if they stop drinking it.
Autumn rolls out its very own red carpet to make a fashionable arrival. So how do falling leaves change colors to dramatic hues of crimson and scarlet?
Nature uses color in lots of different ways. Find out why some types of cabbage are purple and what this means.